A concrete quality detection device for water conservancy construction

Abstract

The present invention relates to the field of pressure detection technology, and specifically to a concrete quality detection device for water conservancy construction, comprising a first pressure-applying device that applies pressure to a concrete block, a pressure sensor that obtains the concrete block's bearing pressure, and a water pressure-applying device that applies water pressure to a closed container, and obtains an initial maximum bearing pressure and an initial critical permeability coefficient by applying pressure and water pressure; sets a designated bearing pressure according to the initial maximum bearing pressure and a designated water pressure corresponding to the initial critical permeability coefficient, adjusts the applied pressure and water pressure, obtains a designated maximum bearing pressure and a designated maximum bearing pressure, and then detects the quality of the concrete block. The present invention obtains a designated critical permeability coefficient and a designated maximum bearing pressure, analyzes the situation of the concrete block under different water pressures and bearing pressures, and then accurately detects the quality of the concrete block according to the designated critical permeability coefficient and the designated maximum bearing pressure.

Description

Technical Field

[0001] The invention relates to the technical field of pressure detection, and in particular to a concrete quality detection device for water conservancy construction. Background Art

[0002] Water conservancy engineering is an engineering discipline involving the development, management and utilization of water resources. Water conservancy engineering plays an important role in promoting economic development, ensuring social security and improving the quality of human life. In the process of constructing water conservancy projects, concrete is an indispensable material. In water conservancy projects, concrete must not only have hardness and strength, but also have certain anti-permeability properties to ensure the stability and reliability of water conservancy construction. Therefore, it is necessary to accurately test the quality of concrete.

[0003] In the existing methods, during the quality inspection of concrete, physical pressure is usually applied to the obtained concrete blocks, and the structural changes inside the concrete blocks are observed by applying different physical pressures to determine the maximum pressure value of the concrete blocks; at the same time, the same batch of obtained concrete blocks are placed in water to analyze the permeability of the concrete blocks and determine the critical permeability coefficient of the concrete blocks; and then the quality of the concrete is inspected by combining the maximum pressure value and critical permeability coefficient of the concrete blocks. However, in actual situations, the applied physical pressure and water pressure exist at the same time, and the two will affect each other, resulting in the inability to accurately analyze the maximum pressure value and critical permeability coefficient of the concrete blocks, and thus the inability to accurately inspect the quality of the concrete. Summary of the invention

[0004] In order to solve the technical problem that the applied physical pressure and water pressure exist at the same time and affect each other, resulting in the inability to accurately analyze the maximum bearing pressure value and critical permeability coefficient of the concrete block, and thus the inability to accurately detect the quality of the concrete, the present invention provides a concrete quality detection device for water conservancy construction, and the technical solution adopted is as follows:

[0005] A concrete quality detection device for water conservancy construction, comprising a closed container, a first pressure device, a water pressure applying device and a control system, wherein a pressure head of the first pressure device is arranged in the closed container, and is used to apply pressure downward to squeeze a concrete block arranged in the closed container, and the pressure head is provided with a pressure sensor for detecting the pressure generated when squeezing the concrete block, the water pressure applying device is communicated with the bottom of the closed container, and the water pressure applying device is provided with a water pressure sensor for detecting the water pressure in the closed container, and the control system is used to control the first pressure device and the water pressure applying device;

[0006] Obtaining the initial maximum bearing pressure and the initial critical permeability coefficient of the concrete block by applying pressure to the concrete block through the first pressure applying device and the water pressure applied to the closed container by the water pressure applying device;

[0007] A preset number of designated bearing pressures are set according to the size of the initial maximum bearing pressure, and the applied pressure and the water pressure are adjusted to obtain a designated critical permeability coefficient under each designated bearing pressure;

[0008] According to the water pressure corresponding to the initial critical permeability coefficient, a preset number of specified water pressures are set, and the applied pressure is adjusted to obtain a specified maximum bearing pressure under each specified water pressure;

[0009] The quality of the concrete block is tested according to the specified critical permeability coefficient and the specified maximum bearing pressure.

[0010] Furthermore, the method for obtaining the initial maximum bearing pressure is:

[0011] The water pressure in the sealed container is always kept at 0, and an ultrasonic image of the concrete block is obtained when the pressure applied by the first pressure applying device to the concrete block is 0, as an initial ultrasonic image;

[0012] Increasing the applied pressure applied by the first pressure applying device to the concrete block according to a first preset step length, acquiring an ultrasonic image of the concrete block after each change in the applied pressure as a reference ultrasonic image corresponding to the applied pressure; and stopping increasing the applied pressure when the applied pressure meets a preset first applied pressure threshold;

[0013] respectively acquiring a differential image between the reference ultrasonic image of each applied pressure and the initial ultrasonic image as a differential image of each applied pressure;

[0014] For any differential image under applied pressure, the pixel points whose grayscale values ​​in the differential image are greater than a preset grayscale threshold are used as reference pixels, and the deformation degree of the concrete block under the applied pressure is obtained according to the grayscale value and local reachable density of each reference pixel;

[0015] According to the change of deformation degree as the applied pressure changes from small to large, the turning point of deformation degree change is obtained by the elbow method;

[0016] The applied pressure corresponding to the turning point of the change is taken as the initial maximum bearing pressure.

[0017] Furthermore, the method for obtaining the initial critical permeability coefficient is:

[0018] According to the relationship among applied pressure, water pressure and bearing pressure, the compensation pressure for each adjustment of applied pressure is obtained;

[0019] Increasing the water pressure applied to the closed container by the water pressure applying device according to the second preset step length, and adjusting the applied pressure according to the compensation pressure each time the water pressure is changed to ensure that the bearing pressure of the concrete block is always kept at 0; until the water pressure meets the preset first water pressure threshold, stopping increasing the water pressure;

[0020] According to the penetration rate of the concrete block and the pressure difference between the inner and outer sides of the concrete block after each change of the water pressure, the penetration parameters of the concrete block under each water pressure are obtained;

[0021] According to the change of the permeability parameter with the change of water pressure from small to large, the turning point of the permeability parameter change is obtained by the elbow method;

[0022] The permeability parameter corresponding to the change turning point is taken as the initial critical permeability coefficient.

[0023] Furthermore, the method for obtaining the compensation pressure is:

[0024] Applying a first preset water pressure to the sealed container, increasing the applied pressure according to a third preset step length, and obtaining the pressure corresponding to each change in the applied pressure through a pressure sensor; and stopping increasing the applied pressure until the applied pressure meets a preset second applied pressure threshold;

[0025] A two-dimensional coordinate system is constructed by taking the applied pressure as the horizontal axis and the received pressure as the vertical axis to obtain the relationship between the applied pressure and the received pressure;

[0026] Apply a first preset applied pressure to the concrete block, increase the water pressure according to a fourth preset step length, and obtain the bearing pressure corresponding to each change in the water pressure through a pressure sensor; until the water pressure meets a preset second water pressure threshold, stop increasing the water pressure;

[0027] A two-dimensional coordinate system is constructed by taking the water pressure as the horizontal axis and the difference between the first preset applied pressure and the bearing pressure as the vertical axis to obtain the relationship between the water pressure and the bearing pressure;

[0028] A three-dimensional coordinate system is constructed based on the relationship between applied pressure and borne pressure, and the relationship between water pressure and borne pressure, where the x-axis is the contact pressure, the y-axis is the water pressure, and the z-axis is the difference between the applied pressure and the contact pressure; a smooth surface is obtained by fitting based on the coordinate points in the three-dimensional coordinate system: ;

[0029] The calculation formula for compensation pressure is: ; In the formula, The compensation pressure for the pressure applied for the n+1th adjustment; The concrete block bears pressure; is the water pressure after the n+1th adjustment; is the water pressure under the nth adjustment; To withstand pressure X and water pressure The difference between applied pressure and contact pressure in the case of To withstand pressure X and water pressure The difference between applied pressure and contact pressure in the case of

[0030] Furthermore, the method for obtaining the permeation rate is:

[0031] The concrete block is in the shape of a cube with a hollow cylinder in the middle that runs through the top and the bottom. The top of the concrete block is completely in contact with the pressure head of the first pressure-applying device, and the hollow bottom of the concrete block is completely in contact with the drainage device at the bottom of the closed container.

[0032] A collecting device is provided below the drainage device for collecting the infiltrated water discharged through the drainage device;

[0033] When the concrete block is subjected to a certain pressure, the amount of water that penetrates during a preset time period is obtained through a collecting device for each water pressure change, which is used as a reference value for penetration at each water pressure;

[0034] For any water pressure, the rate of change of the permeability reference value of the water pressure is taken as the permeability rate of the concrete block under the water pressure.

[0035] Furthermore, the method for obtaining the pressure difference between the inner and outer sides of the concrete block is:

[0036] The pressure inside the concrete block is always atmospheric pressure, and the pressure outside is the water pressure obtained by the water pressure sensor;

[0037] The difference between the water pressure obtained by the water pressure sensor and the atmospheric pressure is used as the pressure difference between the inside and outside of the concrete block.

[0038] Furthermore, the method for obtaining the designated bearing pressure is: randomly selecting a preset number of bearing pressures of different sizes within a range less than the initial maximum bearing pressure as the designated bearing pressure;

[0039] The method for obtaining the designated water pressure is: randomly selecting a preset number of water pressures of different magnitudes within a range less than the water pressure corresponding to the initial critical permeability coefficient as the designated water pressure.

[0040] Furthermore, the method for obtaining the specified critical permeability coefficient is:

[0041] For any specified bearing pressure, the water pressure applied by the water pressure applying device to the closed container is increased according to the second preset step length, and the applied pressure is adjusted according to the compensation pressure each time the water pressure is changed to ensure that the bearing pressure of the concrete block is always maintained at the specified bearing pressure; until the water pressure meets the preset first water pressure threshold, the water pressure is stopped from being increased;

[0042] Under the specified bearing pressure, the target permeability parameter of the concrete block under each water pressure is obtained, and according to the change of the target permeability parameter as the water pressure changes from small to large, the change turning point of the target permeability parameter is obtained by the elbow method;

[0043] The target permeability parameter corresponding to the turning point of the change of the target permeability parameter is used as the specified critical permeability coefficient of the specified bearing pressure.

[0044] Furthermore, the method for obtaining the specified maximum bearing pressure is:

[0045] For any specified water pressure, the water pressure in the sealed container is always maintained at the specified water pressure, the applied pressure applied to the concrete block by the first pressure-applying device is increased according to a first preset step length, and an ultrasonic image of the concrete block is obtained after each change in the applied pressure as a target ultrasonic image corresponding to the applied pressure; until the applied pressure meets a preset first applied pressure threshold, the applied pressure is stopped from being increased;

[0046] respectively acquiring a differential image between each pressure-applied target ultrasonic image and the initial ultrasonic image as each pressure-applied target differential image;

[0047] For any target differential image under applied pressure, the pixel points whose grayscale values ​​in the target differential image are greater than a preset grayscale threshold are taken as target pixel points, and the target deformation degree of the concrete block under the applied pressure is obtained according to the grayscale value and local reachable density of each target pixel point;

[0048] According to the change of the target deformation degree as the applied pressure changes from small to large, the turning point of the target deformation degree is obtained by the elbow method;

[0049] The bearing pressure corresponding to the applied pressure corresponding to the turning point of the change of the target deformation degree is used as the specified maximum bearing pressure of the specified water pressure.

[0050] Furthermore, the method for testing the quality of the concrete block according to the specified critical permeability coefficient and the specified maximum bearing pressure is:

[0051] Obtain the mean value of the specified critical permeability coefficient as the reference critical permeability coefficient;

[0052] Get the average value of the specified maximum bearing pressure as the reference maximum bearing pressure;

[0053] When the reference critical permeability coefficient is less than the standard critical permeability coefficient and the reference maximum bearing pressure is greater than the standard maximum bearing pressure, the quality of the concrete block is qualified;

[0054] When the reference critical permeability coefficient is greater than or equal to the standard critical permeability coefficient, or the reference maximum bearing pressure is less than or equal to the standard maximum bearing pressure, the quality of the concrete block is unqualified.

[0055] The present invention has the following beneficial effects:

[0056] The present invention comprises a closed container, a first pressure-applying device, and a water pressure-applying device. The pressure head of the first pressure-applying device is arranged in the closed container, and is used for applying downward pressure to extrude a concrete block arranged in the closed container. The pressure head is provided with a pressure sensor for detecting the bearing pressure generated when the concrete block is extruded. The water pressure-applying device is connected with the bottom of the closed container. The water pressure-applying device is provided with a water pressure sensor for detecting the water pressure in the closed container, so that the bearing pressure and water pressure of the concrete block in the closed container can be adjusted at the same time, which fits the real scene where the concrete block is located, and is conducive to accurately analyzing the bearing capacity and permeability of the concrete block; and then, the initial maximum bearing pressure and initial critical permeability coefficient of the concrete block are obtained by applying the applied pressure to the concrete block by the first pressure-applying device and the water pressure applied to the closed container by the water pressure-applying device, which is conducive to the subsequent accurate setting of different bearing pressures and different water pressures of the concrete block, and avoiding the bearing pressure or water pressure If the setting is too large, the shape of the concrete block will be damaged, and the quality of the concrete block cannot be accurately analyzed. Then, a preset number of specified bearing pressures are set according to the size of the initial maximum bearing pressure, the applied pressure and the water pressure are adjusted, and the specified critical permeability coefficient under each specified bearing pressure is obtained, which is conducive to a more comprehensive analysis of the permeability of the concrete block under different environments. At the same time, a preset number of specified water pressures are set according to the water pressure corresponding to the initial critical permeability coefficient, the applied pressure is adjusted, and the specified maximum bearing pressure under each specified water pressure is obtained, which is conducive to a more comprehensive analysis of the bearing capacity of the concrete block under different environments. By analyzing the specified critical permeability coefficient and the specified maximum bearing pressure, the situation of analyzing the bearing capacity and permeability of the concrete block under a single condition is avoided, and then the quality of the concrete block is more accurately tested according to the specified critical permeability coefficient and the specified maximum bearing pressure to ensure the stability and safety of the water conservancy project. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0058] Figure 1 A structural diagram of a concrete quality detection device for water conservancy construction provided by one embodiment of the present invention;

[0059] Figure 2 for Figure 1 An enlarged view of the water pressure applying device A;

[0060] Figure 3 for Figure 1 An enlarged view of the middle drainage device B;

[0061] Figure 4 A flow chart of a method for testing the quality of concrete for water conservancy construction provided by one embodiment of the present invention;

[0062] Figure 5 A flow chart of a method for obtaining an initial critical permeability coefficient provided by an embodiment of the present invention;

[0063] Figure 6 A flow chart of a specific method for obtaining an initial critical permeability coefficient provided by an embodiment of the present invention;

[0064] In the figure, 1 is a workbench, 101 is a collecting device, 2 is a closed container, 201 is a first pressure-applying device, 202 is a pressure head, 206 is a pressure rod, 204 is a pressure sensor, 203 is an ultrasonic device, 3 is a control system, 4 is an arm, 5 is an upper cover, 501 is a second pressure-applying device, A is a water pressure-applying device, B is a drainage device, 6 is a water pump, 601 is a pipeline, 602 is a valve, 603 is a water pressure sensor and 301 is a drainage hole. DETAILED DESCRIPTION

[0065] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following is a detailed description of the concrete quality detection device for water conservancy construction proposed by the present invention, its specific implementation method, structure, characteristics and effects, in combination with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0066] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0067] The specific scheme of the concrete quality detection device for water conservancy construction provided by the present invention is described in detail below with reference to the accompanying drawings.

[0068] See also Figure 1, which shows a structural diagram of a concrete quality detection device for water conservancy construction provided by an embodiment of the present invention, including a workbench 1, a collecting device 101, a closed container 2, a first pressure device 201, a pressure head 202, a pressure rod 206, a pressure sensor 204, an ultrasonic device 203, a control system 3, a support arm 4, an upper cover 5, a second pressure device 501, a water pressure applying device A and a drainage device B. The concrete quality detection device is located on the workbench 1, and the sealed container 2 is used to place concrete blocks. The pressure head 202 of the first pressure-applying device 201 passes through the upper cover 5 of the sealed container 2 through the pressure rod 206 and is arranged in the sealed container 2, and is used to apply pressure downward to directly squeeze the concrete blocks arranged in the sealed container 2. The pressure head 202 is provided with a pressure sensor 204 for detecting the pressure generated when squeezing the concrete blocks. The support arm 4 is directly connected to one side of the sealed container 2 to support the sealed container 2 and maintain the stability of the sealed container 2. The second pressure-applying device 501 is used to fix the upper cover 5 of the sealed container 2 to ensure that the position of the upper cover 5 remains unchanged. The water pressure applying device A is connected to the bottom of the sealed container 2 and is used to control the water pressure in the sealed container 2, such as Figure 2 The enlarged view of the water pressure applying device A is shown. Figure 2 The device 200 includes a water pump 6, a pipe 601, a valve 602 and a water pressure sensor 603. The sealed container 2 is connected to the water pump 6 through the pipe 601. The valve 602 and the water pressure sensor 603 are arranged on the pipe 601. The water pressure in the sealed container 2 is controlled by the valve 602, and the water pressure in the sealed container 2 is obtained by the water pressure sensor 603. The ultrasonic device 203 is located on one side of the sealed container and is used to obtain ultrasonic data of the concrete block. The ultrasonic device 203 includes an ultrasonic transmitter (not shown), an ultrasonic receiver (not shown), a signal processing unit (not shown) and a data recording system (not shown). The ultrasonic transmitter is used to generate an ultrasonic signal and send it to the concrete block located in the sealed container 2. The ultrasonic receiver is used to receive the ultrasonic signal reflected from the concrete block located in the sealed container 2. The signal processing unit is used to amplify, filter and analyze the received ultrasonic signal. The data recording system is used to record the time history and intensity change of the ultrasonic signal. The drainage device B is located at the bottom of the sealed container 2 and is used to discharge the water that penetrates into the concrete block into the collection device 101. Figure 3 The enlarged view of drainage device B is shown. Figure 3The device 101 includes a plurality of drainage holes 301 for discharging the infiltrated water in the concrete block to the collecting device 101 to obtain the amount of infiltrated water; the pressure applied by the first pressure applying device 201, the pressure applied by the second pressure applying device 501 and the water pressure applied by the water pressure applying device A to the closed container 2 are controlled by the control system 3. The control system 3 and the first pressure applying device 201, the second pressure applying device 501, the collecting device 101, the ultrasonic device 203 and the water pressure applying device A can be connected by wire or wirelessly, which is not limited here.

[0069] It should be noted that the concrete block placed in the closed container 2 must be hollow in the middle to ensure that the hollow shape of the middle is completely consistent with the drainage device. Figure 3 It can be seen that the drainage device is circular, therefore, in this embodiment, the shape of the concrete block is set to be a cube with a hollow cylinder in the middle that runs through the top and the bottom, so that the inner wall of the concrete block is completely consistent with the drainage device, ensuring that the water in the closed container 2 cannot enter the inner side of the concrete block from the bottom of the concrete block, and at the same time, the pressure head 202 of the first pressure device 201 is completely fitted with the top of the concrete block, ensuring that the water in the closed container 2 cannot enter the inner side of the concrete block from the top of the concrete block. Among them, the concrete block is in the closed container, and there is a certain gap between the side wall of the concrete block and the inner wall of the closed container.

[0070] See also Figure 4 , which shows a flow chart of a method for detecting the quality of concrete for water conservancy construction provided by an embodiment of the present invention, the method comprising:

[0071] Step S1: Obtain the initial maximum bearing pressure and initial critical permeability coefficient of the concrete block by applying pressure to the concrete block through the first pressure applying device and the water pressure applied to the closed container by the water pressure applying device.

[0072] Specifically, in order to detect the quality of concrete, the same batch of concrete is cut into concrete blocks, which is conducive to using the concrete quality detection device for water conservancy construction to detect the quality of concrete. It is known that the bearing capacity and water permeability of concrete blocks can reflect the quality of concrete blocks. When the maximum bearing pressure of concrete blocks is greater and the permeability coefficient is smaller, the quality of concrete blocks is better. In the current method, the maximum bearing pressure and critical permeability coefficient of concrete blocks are analyzed in a single case. For example, when analyzing the maximum bearing pressure of concrete blocks, only the applied pressure applied to the concrete blocks is considered, and the influence of water pressure is not considered. At this time, the bearing pressure of concrete blocks is the applied pressure applied to concrete blocks; when analyzing the permeability of concrete blocks, only the water pressure of the environment in which the concrete blocks are located is considered, and the bearing pressure of the concrete blocks themselves is not considered. In actual situations, the concrete in water conservancy projects will be affected by both water pressure and its own pressure. Therefore, there are inaccuracies in analyzing the bearing capacity and permeability of concrete blocks in a single case, resulting in inaccurate quality analysis of concrete blocks.

[0073] In order to avoid the situation that the pressure or water pressure applied to the concrete block by the device is too large during the analysis of the concrete block, resulting in the inability to accurately analyze the pressure-bearing permeability coefficient of the concrete block, therefore, this embodiment first regulates the pressure applied to the concrete block by the first pressure-applying device and the water pressure applied to the closed container by the water pressure-applying device to obtain the initial maximum bearing pressure and initial critical permeability coefficient of the concrete block. Limiting the range of bearing pressure and water pressure on the basis of the initial maximum bearing pressure and initial critical permeability coefficient is conducive to more accurate analysis of the quality of the concrete block.

[0074] Preferably, in a method that can be implemented in this embodiment, the method for obtaining the initial maximum bearing pressure is: placing a concrete block to be tested in a closed container, keeping the water pressure in the closed container at 0 through a control system, and obtaining an ultrasonic image of the concrete block when the applied pressure of the first pressure-applying device on the concrete block is 0, as the initial ultrasonic image; wherein, when the applied pressure is 0, it means that the bearing pressure of the concrete block is 0, because when the water pressure is 0, that is, when there is no water pressure, the bearing pressure of the concrete block is equal to the applied pressure applied to the concrete block. In a method that can be implemented in this embodiment, the method for obtaining the ultrasonic image is: obtaining the internal structure ultrasonic data of the concrete block through an ultrasonic device, and converting the internal structure ultrasonic data of the concrete block into an ultrasonic image through an ultrasonic array imaging algorithm. wherein, the ultrasonic array imaging algorithm is a well-known algorithm and is not limited here. it should be noted that the ultrasonic device can directly skip the influence of water in the closed container and directly obtain the internal structure ultrasonic data of the concrete block.

[0075] In order to accurately analyze the bearing capacity of the concrete block, this embodiment gradually increases the applied pressure on the concrete block, observes and analyzes the deformation of the concrete block each time the applied pressure is increased, and then infers the initial maximum bearing pressure of the concrete block. In this embodiment, the first preset step length is set to 5 Pascals. The implementer can set the size of the first preset step length according to actual conditions, which is not limited here. The applied pressure applied to the concrete block by the first pressure-applying device is increased according to the first preset step length, and an ultrasonic image of the concrete block after each change in the applied pressure is obtained as a reference ultrasonic image corresponding to the applied pressure; until the applied pressure meets the preset first applied pressure threshold, stop increasing the applied pressure; in this embodiment, the preset first applied pressure threshold is set to 500 Pascals. The implementer can set the size of the preset first applied pressure threshold according to actual conditions, which is not limited here. In order to analyze the deformation of the concrete block under different applied pressures, this embodiment obtains the difference image between the reference ultrasonic image and the initial ultrasonic image of each applied pressure as the difference image of each applied pressure; it should be noted that the grayscale value of the pixel point in the difference image is the absolute value of the difference between the grayscale values ​​of the pixel point at the same position of the corresponding reference ultrasonic image and the initial ultrasonic image, and therefore, the grayscale value in the difference image must be greater than or equal to 0.

[0076] For any differential image under applied pressure, the pixel point whose grayscale value in the differential image is greater than the preset grayscale threshold is used as the reference pixel point. In this embodiment, the preset grayscale threshold is set to 0. The pixel point in the differential image that is not 0 is more likely to be the area where the concrete block is deformed under the corresponding applied pressure. When the grayscale value of the reference pixel point is larger, the deformation is more obvious; at the same time, when the reference pixel points are distributed more densely, the area where the concrete block is deformed under the corresponding applied pressure is more concentrated, and the deformation degree of the concrete block is greater; therefore, according to the grayscale value and local reachable density of each reference pixel point, the deformation degree of the concrete block under the applied pressure is obtained; wherein, the method of obtaining the local reachable density by the local outlier factor algorithm is a known calculation and will not be described in detail. According to the change of the deformation degree as the applied pressure changes from small to large, the turning point of the deformation degree is obtained by the elbow method; the applied pressure corresponding to the turning point of the change is used as the initial maximum bearing pressure. wherein, the elbow method is a known technology and will not be described in detail.

[0077] In order to accurately represent the deformation degree of the concrete block under each applied pressure, this embodiment specifically quantifies the deformation degree as a deformation degree value. The larger the deformation degree value, the more obvious the deformation of the concrete block under the corresponding applied pressure. The calculation formula of the deformation degree value is: ; In the formula, is the deformation value of the concrete block under the i-th pressure application; M is the total number of reference pixels in the differential image under the i-th pressure application; is the gray value of the mth reference pixel in the differential image of the i-th pressure application; is the local reachable density of the mth reference pixel in the differential image of the ith pressure application; norm is the normalization function.

[0078] At this point, the deformation degree value of the concrete block under each applied pressure is obtained.

[0079] A two-dimensional coordinate system is constructed with the applied pressure as the horizontal axis and the deformation degree value as the vertical axis. The deformation degree value of the concrete block under each applied pressure is represented by the corresponding data points in the two-dimensional coordinate system, and then the turning point of the deformation degree change in the two-dimensional coordinate system is obtained by the elbow method. At this time, the applied pressure is the same as the bearing pressure. Therefore, the applied pressure corresponding to the turning point of the change is the initial maximum bearing pressure.

[0080] Preferably, in one possible implementation of this embodiment, the method for obtaining the initial critical permeability coefficient can be found in Figure 5 , which shows a flow chart of a method for obtaining an initial critical permeability coefficient provided in this embodiment, the method comprising the following steps:

[0081] Step S101: Obtain compensation pressure.

[0082] The permeability of concrete blocks is analyzed by adjusting the water pressure in a closed container. However, when adjusting the water pressure, the bearing pressure and applied pressure of the concrete blocks are no longer equal, because the water in the closed container will generate a force opposite to the applied pressure, and the water pressure and applied pressure will affect each other, resulting in instability of the bearing pressure of the concrete blocks. In order to ensure that the bearing pressure of the concrete blocks remains unchanged, the applied pressure should also be adjusted accordingly when adjusting the water pressure. In order to analyze the compensation pressure that should be adjusted for the applied pressure during each adjustment of the water pressure, the present embodiment first analyzes the relationship between the applied pressure, the water pressure and the bearing pressure, and then obtains the compensation pressure for each adjustment of the applied pressure based on the relationship between the applied pressure, the water pressure and the bearing pressure.

[0083] Preferably, in a method that can be implemented in this embodiment, the method for obtaining the compensation pressure is: put a new concrete block to be tested in a closed container, apply a first preset water pressure to the closed container, and set the first preset water pressure to 10 Pascals in this embodiment. The implementer can set the size of the first preset water pressure according to actual conditions, which is not limited here. In order to analyze the relationship between the applied pressure and the borne pressure under the first preset water pressure, the third preset step length is set to 3 Pascals in this embodiment. The implementer can set the size of the third preset step length according to actual conditions, which is not limited here, and then increase the applied pressure according to the third preset step length, and obtain the borne pressure corresponding to each change in the applied pressure through the pressure sensor; until the applied pressure meets the preset second applied pressure threshold, stop increasing the applied pressure; in this embodiment, the preset second applied pressure threshold is set to 100 Pascals, and the implementer can set the size of the preset second applied pressure threshold according to actual conditions, which is not limited here. Construct a two-dimensional coordinate system with the applied pressure as the horizontal axis and the borne pressure as the vertical axis to obtain the relationship between the applied pressure and the borne pressure under the first preset water pressure;

[0084] A new concrete block to be tested is placed in a sealed container, and a first preset applied pressure is applied to the concrete block. In this embodiment, the first preset applied pressure is set to 20 Pascals. The implementer can set the size of the first preset applied pressure according to the actual situation, which is not limited here. In order to analyze the relationship between water pressure and bearing pressure under the first preset applied pressure, in this embodiment, the fourth preset step length is set to 3 Pascals. The implementer can set the size of the fourth preset step length according to the actual situation, which is not limited here. Then, the water pressure is increased according to the fourth preset step length, and the bearing pressure corresponding to each change in water pressure is obtained through the pressure sensor; until the water pressure meets the preset second water pressure threshold, the water pressure is stopped from increasing; in this embodiment, the preset second water pressure threshold is set to 100 Pascals. The implementer can set the size of the preset second water pressure threshold according to the actual situation, which is not limited here. A two-dimensional coordinate system is constructed with water pressure as the horizontal axis and the difference between the first preset applied pressure and the bearing pressure as the vertical axis to obtain the relationship between water pressure and bearing pressure; in actual situations, the applied pressure must not be less than the bearing pressure, so the difference between the first preset applied pressure and the bearing pressure must be a non-negative number;

[0085] According to the relationship between applied pressure and borne pressure, and the relationship between water pressure and borne pressure, a three-dimensional coordinate system is constructed by mapping, where the x-axis is the contact pressure, the y-axis is the water pressure, and the z-axis is the difference between the applied pressure and the contact pressure; according to the coordinate points in the three-dimensional coordinate system, a smooth surface is obtained by fitting: ; Among them, smooth surface: The method for obtaining is a well-known technology and will not be described in detail;

[0086] It is known that the n+1th change in applied pressure is based on the applied pressure after the nth change. Therefore, under the condition that the bearing pressure of the concrete block is ensured to be stable, the calculation formula for the compensation pressure of the n+1th adjustment of applied pressure is: ; In the formula, The compensation pressure for the pressure applied for the n+1th adjustment; The concrete block bears pressure; is the water pressure after the n+1th adjustment; is the water pressure under the nth adjustment; To withstand pressure X and water pressure The difference between applied pressure and contact pressure in the case of To withstand pressure X and water pressure The difference between applied pressure and contact pressure in the case of

[0087] Now, when the water pressure fluctuates, the applied pressure can be accurately adjusted to ensure that the pressure on the concrete block remains stable.

[0088] Step S102: Obtaining the initial critical permeability coefficient.

[0089] In order to accurately analyze the permeability of concrete blocks without the influence of external forces, a new concrete block to be tested is placed in a closed container. In this embodiment, the water pressure applied to the closed container by the water pressure applying device is increased according to the second preset step length while ensuring that the pressure on the concrete block is 0. Each time the water pressure is changed, the applied pressure is adjusted according to the compensation pressure to ensure that the pressure on the concrete block is always kept at 0; until the water pressure meets the preset first water pressure threshold, the water pressure is stopped from being increased; in this embodiment, the second preset step length is set to 5 Pascals, and the preset first water pressure threshold is set to 300 Pascals. The implementer can set the second preset step length and the preset first water pressure threshold according to actual conditions, which are not limited here. According to the permeability rate of the concrete block and the pressure difference between the inside and outside of the concrete block after each change of the water pressure, the permeability parameters of the concrete block under each water pressure are obtained; according to the change of the permeability parameters with the change of water pressure from small to large, the change turning point of the permeability parameters is obtained by the elbow method; the permeability parameters corresponding to the change turning point are used as the initial critical permeability coefficient.

[0090] In one possible implementation of this embodiment, the specific method for obtaining the initial critical permeability coefficient is as follows: Figure 6 , which shows a flow chart of a specific method for obtaining an initial critical permeability coefficient provided in this embodiment, the method comprising the following steps:

[0091] Step S102-1: Obtain the penetration rate.

[0092] It is known that the shape of the concrete block is a cube with a hollow cylinder running through the top and the bottom in the middle. The top of the concrete block is completely in line with the pressure head of the first pressure-applying device, and the hollow bottom of the concrete block is completely in line with the drainage device at the bottom of the closed container; ensuring that the water in the closed container will not enter the interior of the concrete block from the top and bottom of the concrete block, so that the water discharged from the drainage device is the water in the closed container that penetrates into the concrete block.

[0093] A collecting device is provided below the drainage device to collect the infiltrated water discharged by the drainage device; when the concrete block is subjected to a certain pressure, the amount of infiltrated water in a preset time period is obtained through the collecting device for each water pressure change, which is used as the infiltration reference value for each water pressure; in this embodiment, the preset time period is set to 30 minutes, and the implementer can set the size of the preset time period according to actual conditions, which is not limited here. For any water pressure, the rate of change of the infiltration reference value of the water pressure, that is, the ratio of the infiltration reference value to the preset time period, is used as the infiltration rate of the concrete block under the water pressure.

[0094] Step S102-2: Obtain the pressure difference between the inside and outside of the concrete block.

[0095] In actual situations, the inside of the concrete block is connected to the outside world through a drainage device. Therefore, the pressure inside the concrete block is always atmospheric pressure, and the pressure outside is the water pressure obtained by the water pressure sensor. The difference between the water pressure obtained by the water pressure sensor and the atmospheric pressure is used as the pressure difference between the inside and outside of the concrete block.

[0096] Step S102-3: Obtaining the initial critical permeability coefficient.

[0097] It is known that the permeability of a concrete block is reflected by the permeability coefficient of the concrete block. Therefore, this embodiment obtains the permeability coefficient of the concrete block under different water pressures. The method for obtaining the permeability coefficient is a well-known technique. When obtaining the permeability coefficient for each change in water pressure, it is necessary to know the permeability rate of the concrete block under the corresponding water pressure, the pressure difference between the inside and outside of the concrete block, the permeability area of ​​the concrete block, and the permeability thickness of the concrete block. In this embodiment, the permeability area of ​​the concrete block is the side area of ​​the concrete block, i.e., the total area of ​​the front, back, left, and right four faces. The permeability thickness of the concrete block is the thinnest thickness between the inner wall and the outer wall of the concrete block.

[0098] As an example, when the bearing pressure of the concrete block is kept at 0, taking the a-th change of water pressure as an example, the calculation formula of the permeability parameter of the concrete block under the a-th water pressure is: ; In the formula, is the permeability parameter of the concrete block under the ath water pressure; is the penetration rate of the concrete block under the a-th water pressure; L is the penetration thickness of the concrete block; A is the penetration area of ​​the concrete block; is the pressure difference between the inside and outside of the concrete block under the ath water pressure.

[0099] At this point, when the concrete block is not under pressure, the permeability coefficient of the concrete block under each changed water pressure is obtained.

[0100] In order to analyze the critical permeability coefficient of the concrete block when it is not affected by the pressure, a two-dimensional coordinate system is constructed with water pressure as the horizontal axis and permeability coefficient as the vertical axis. The permeability coefficient of the concrete block under each water pressure is expressed by corresponding data points in the two-dimensional coordinate system, and then the turning point of the permeability parameter in the two-dimensional coordinate system is obtained by the elbow method. At this time, the permeability coefficient corresponding to the turning point of the change is the initial critical permeability coefficient.

[0101] Step S2: setting a preset number of designated bearing pressures according to the size of the initial maximum bearing pressure, adjusting the applied pressure and the water pressure, and obtaining a designated critical permeability coefficient under each designated bearing pressure.

[0102] Specifically, in order to accurately analyze the permeability of concrete blocks in actual situations, this embodiment randomly selects a preset number of bearing pressures of different sizes within a range less than the initial maximum bearing pressure as the designated bearing pressure. The purpose of selecting the designated bearing pressure within a range less than the initial maximum bearing pressure is to avoid setting the designated bearing pressure too large, which may cause cracks in the concrete block and thus fail to accurately obtain the designated critical permeability coefficient under the designated bearing pressure. This embodiment sets the preset number to 10, and the implementer may set the size of the preset number and the size of the designated bearing pressure according to actual conditions, which are not limited here.

[0103] According to the method for obtaining the initial critical permeability coefficient, the critical permeability coefficient corresponding to the concrete block under each specified bearing pressure is obtained, that is, the specified critical permeability coefficient of each specified bearing pressure.

[0104] In order to explain the acquisition of the specified critical permeability coefficient in more detail, this embodiment uses a new concrete block to be tested for analysis when analyzing any specified bearing pressure. The method for acquiring the specified critical permeability coefficient is as follows: for any specified bearing pressure, increase the water pressure applied to the closed container by the water pressure application device according to the second preset step length, and adjust the applied pressure according to the compensation pressure each time the water pressure is changed to ensure that the bearing pressure of the concrete block is always maintained at the specified bearing pressure; until the water pressure meets the preset first water pressure threshold, stop increasing the water pressure; obtain the target permeability parameter of the concrete block under each water pressure under the specified bearing pressure, and obtain the turning point of the change of the target permeability parameter by the elbow method according to the change of the target permeability parameter with the change of water pressure from small to large; the target permeability parameter corresponding to the turning point of the change of the target permeability parameter is used as the specified critical permeability coefficient of the specified bearing pressure.

[0105] At this point, the specified critical permeability coefficient at each specified bearing pressure is obtained.

[0106] Step S3: setting a preset number of specified water pressures according to the water pressure corresponding to the initial critical permeability coefficient, adjusting the applied pressure, and obtaining a specified maximum bearing pressure under each specified water pressure.

[0107] Specifically, in order to accurately analyze the bearing pressure of the concrete block in actual conditions, this embodiment randomly selects a preset number of water pressures of different sizes within the range of the water pressure corresponding to the initial critical permeability coefficient as the designated water pressure. The purpose of selecting the designated water pressure within the range of the water pressure corresponding to the initial critical permeability coefficient is to avoid the designated water pressure being too large, which may affect the bearing capacity of the concrete block. The implementer may set the size of the designated water pressure according to actual conditions, which is not limited here.

[0108] You can refer to the method for obtaining the initial maximum bearing pressure to obtain the specified maximum bearing pressure of the concrete block under each specified water pressure. It should be noted that during the entire process of obtaining the initial maximum bearing pressure, the water pressure is always kept at 0, so the applied pressure is always equal to the bearing pressure; when there is water pressure, the applied pressure and the bearing pressure will not be equal, so under a specified water pressure, the bearing pressure corresponding to the applied pressure corresponding to the turning point of the deformation value corresponding to the change is used as the specified maximum bearing pressure under the specified water pressure.

[0109] In order to explain the acquisition of the specified maximum bearing pressure in more detail, in this embodiment, when analyzing any specified water pressure, a new concrete block to be tested is used for analysis. The method for obtaining the specified maximum bearing pressure is as follows: for any specified water pressure, the water pressure in the sealed container is always maintained at the specified water pressure, the applied pressure applied to the concrete block by the first pressure-applying device is increased according to a first preset step length, and an ultrasonic image of the concrete block after each change in the applied pressure is obtained as a target ultrasonic image corresponding to the applied pressure; until the applied pressure meets the preset first applied pressure threshold, the applied pressure is stopped from being increased; a differential image between the target ultrasonic image of each applied pressure and the initial ultrasonic image is obtained respectively as a target differential image of each applied pressure; for any target differential image of the applied pressure, a pixel point with a gray value greater than a preset gray threshold in the target differential image is taken as a target pixel point, and a target deformation degree of the concrete block under the applied pressure is obtained according to the gray value and local reachable density of each target pixel point; according to the change of the target deformation degree with the change of the applied pressure from small to large, a turning point of the change of the target deformation degree is obtained by the elbow method; because of the influence of water pressure, the magnitude of the applied pressure and the bearing pressure are different, and therefore, the bearing pressure corresponding to the applied pressure corresponding to the turning point of the change of the target deformation degree is taken as the specified maximum bearing pressure of the specified water pressure.

[0110] At this point, the specified maximum withstand pressure for each specified water pressure is obtained.

[0111] Step S4: testing the quality of the concrete block according to the specified critical permeability coefficient and the specified maximum bearing pressure.

[0112] Specifically, in order to accurately reflect the bearing capacity and permeability of the concrete block, the present embodiment obtains the mean value of the specified critical permeability coefficient as the reference critical permeability coefficient; obtains the mean value of the specified maximum bearing pressure as the reference maximum bearing pressure; when the reference critical permeability coefficient is less than the standard critical permeability coefficient and the reference maximum bearing pressure is greater than the standard maximum bearing pressure, the quality of the concrete block is qualified; when the reference critical permeability coefficient is greater than or equal to the standard critical permeability coefficient, or the reference maximum bearing pressure is less than or equal to the standard maximum bearing pressure, the quality of the concrete block is unqualified. Among them, the standard critical permeability coefficient and the standard maximum bearing pressure are set by relevant staff and are not limited here.

[0113] At this point, the quality of the concrete blocks is tested to determine the quality of the concrete.

[0114] In summary, this embodiment includes a first pressure-applying device applying pressure to the concrete block, a pressure sensor obtaining the concrete block bearing pressure, and a water pressure-applying device applying water pressure to a closed container, and obtaining the initial maximum bearing pressure and the initial critical permeability coefficient by applying pressure and water pressure; setting a designated bearing pressure according to the initial maximum bearing pressure and the initial critical permeability coefficient corresponding to the water pressure setting a designated water pressure, adjusting the applied pressure and water pressure, obtaining the designated maximum bearing pressure and the designated maximum bearing pressure, and then detecting the quality of the concrete block. The present invention obtains the designated critical permeability coefficient and the designated maximum bearing pressure, analyzes the situation of the concrete block under different water pressures and bearing pressures, and then accurately detects the quality of the concrete block according to the designated critical permeability coefficient and the designated maximum bearing pressure.

[0115] It should be noted that the sequence of the above embodiments of the present invention is only for description and does not represent the advantages and disadvantages of the embodiments. The processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0116] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

Claims

1. A concrete quality detection device for water conservancy construction, comprising a closed container, a first pressure applying device, a water pressure applying device and a control system, characterized in that: The pressure head of the first pressure-applying device is arranged in the closed container, and is used to apply downward pressure to squeeze the concrete block arranged in the closed container. The pressure head is provided with a pressure sensor for detecting the pressure generated when squeezing the concrete block. The water pressure-applying device is connected to the bottom of the closed container, and the water pressure-applying device is provided with a water pressure sensor for detecting the water pressure in the closed container. The control system is used to control the first pressure-applying device and the water pressure-applying device. Obtaining the initial maximum bearing pressure and the initial critical permeability coefficient of the concrete block by applying pressure to the concrete block through the first pressure applying device and the water pressure applied to the closed container by the water pressure applying device; A preset number of designated bearing pressures are set according to the size of the initial maximum bearing pressure, and the applied pressure and the water pressure are adjusted to obtain a designated critical permeability coefficient under each designated bearing pressure; According to the water pressure corresponding to the initial critical permeability coefficient, a preset number of specified water pressures are set, and the applied pressure is adjusted to obtain a specified maximum bearing pressure under each specified water pressure; Testing the quality of the concrete block according to the specified critical permeability coefficient and the specified maximum bearing pressure; The method for obtaining the initial maximum bearing pressure is: The water pressure in the sealed container is always kept at 0, and an ultrasonic image of the concrete block is obtained when the pressure applied by the first pressure applying device to the concrete block is 0, as an initial ultrasonic image; Increasing the applied pressure applied by the first pressure applying device to the concrete block according to a first preset step length, acquiring an ultrasonic image of the concrete block after each change in the applied pressure as a reference ultrasonic image corresponding to the applied pressure; and stopping increasing the applied pressure when the applied pressure meets a preset first applied pressure threshold; respectively acquiring a differential image between the reference ultrasonic image of each applied pressure and the initial ultrasonic image as a differential image of each applied pressure; For any differential image under applied pressure, the pixel points whose grayscale values ​​in the differential image are greater than a preset grayscale threshold are used as reference pixels, and the deformation degree of the concrete block under the applied pressure is obtained according to the grayscale value and local reachable density of each reference pixel; According to the change of deformation degree as the applied pressure changes from small to large, the turning point of deformation degree change is obtained by the elbow method; The applied pressure corresponding to the turning point of the change is taken as the initial maximum bearing pressure; The method for obtaining the initial critical permeability coefficient is: According to the relationship among applied pressure, water pressure and bearing pressure, the compensation pressure for each adjustment of applied pressure is obtained; Increasing the water pressure applied to the closed container by the water pressure applying device according to the second preset step length, and adjusting the applied pressure according to the compensation pressure each time the water pressure is changed to ensure that the bearing pressure of the concrete block is always kept at 0; until the water pressure meets the preset first water pressure threshold, stopping increasing the water pressure; According to the penetration rate of the concrete block and the pressure difference between the inner and outer sides of the concrete block after each change of the water pressure, the penetration parameters of the concrete block under each water pressure are obtained; According to the change of the permeability parameter with the change of water pressure from small to large, the turning point of the permeability parameter change is obtained by the elbow method; The permeability parameter corresponding to the change turning point is used as the initial critical permeability coefficient; The method for obtaining the compensation pressure is: Applying a first preset water pressure to the sealed container, increasing the applied pressure according to a third preset step length, and obtaining the pressure corresponding to each change in the applied pressure through a pressure sensor; and stopping increasing the applied pressure until the applied pressure meets a preset second applied pressure threshold; A two-dimensional coordinate system is constructed by taking the applied pressure as the horizontal axis and the received pressure as the vertical axis to obtain the relationship between the applied pressure and the received pressure; Applying a first preset applied pressure to the concrete block, increasing the water pressure according to a fourth preset step length, and obtaining a bearing pressure corresponding to each change in the water pressure through a pressure sensor; When the water pressure meets a preset second water pressure threshold, the water pressure is stopped from being increased; A two-dimensional coordinate system is constructed by taking the water pressure as the horizontal axis and the difference between the first preset applied pressure and the bearing pressure as the vertical axis to obtain the relationship between the water pressure and the bearing pressure; A three-dimensional coordinate system is constructed based on the relationship between applied pressure and borne pressure, and the relationship between water pressure and borne pressure, where the x-axis is the contact pressure, the y-axis is the water pressure, and the z-axis is the difference between the applied pressure and the contact pressure; a smooth surface is obtained by fitting based on the coordinate points in the three-dimensional coordinate system: ; The calculation formula for compensation pressure is: ; In the formula, The compensation pressure for the pressure applied for the n+1th adjustment; The concrete block bears pressure; is the water pressure after the n+1th adjustment; is the water pressure under the nth adjustment; To withstand pressure X and water pressure The difference between applied pressure and contact pressure in the case of To withstand pressure X and water pressure The difference between applied pressure and contact pressure in the case of 2. A concrete quality detection device for water conservancy construction as claimed in claim 1, characterized in that: The method for obtaining the permeation rate is: The concrete block is in the shape of a cube with a hollow cylinder in the middle that runs through the top and the bottom. The top of the concrete block is completely in contact with the pressure head of the first pressure-applying device, and the hollow bottom of the concrete block is completely in contact with the drainage device at the bottom of the closed container. A collecting device is provided below the drainage device for collecting the infiltrated water discharged through the drainage device; When the concrete block is subjected to a certain pressure, the amount of water that penetrates during a preset time period is obtained through a collecting device for each water pressure change, which is used as a reference value for penetration at each water pressure; For any water pressure, the rate of change of the permeability reference value of the water pressure is taken as the permeability rate of the concrete block under the water pressure.

3. A concrete quality detection device for water conservancy construction as claimed in claim 1, characterized in that: The method for obtaining the pressure difference between the inner and outer sides of the concrete block is: The pressure inside the concrete block is always atmospheric pressure, and the pressure outside is the water pressure obtained by the water pressure sensor; The difference between the water pressure obtained by the water pressure sensor and the atmospheric pressure is used as the pressure difference between the inside and outside of the concrete block.

4. A concrete quality detection device for water conservancy construction as claimed in claim 1, characterized in that: The method for obtaining the designated bearing pressure is: randomly selecting a preset number of bearing pressures of different sizes within a range less than the initial maximum bearing pressure as the designated bearing pressure; The method for obtaining the designated water pressure is: randomly selecting a preset number of water pressures of different magnitudes within a range less than the water pressure corresponding to the initial critical permeability coefficient as the designated water pressure.

5. A concrete quality detection device for water conservancy construction as claimed in claim 1, characterized in that: The method for obtaining the specified critical permeability coefficient is: For any specified bearing pressure, the water pressure applied by the water pressure applying device to the closed container is increased according to the second preset step length, and the applied pressure is adjusted according to the compensation pressure each time the water pressure is changed to ensure that the bearing pressure of the concrete block is always maintained at the specified bearing pressure; until the water pressure meets the preset first water pressure threshold, the water pressure is stopped from being increased; Under the specified bearing pressure, the target permeability parameter of the concrete block under each water pressure is obtained, and according to the change of the target permeability parameter as the water pressure changes from small to large, the change turning point of the target permeability parameter is obtained by the elbow method; The target permeability parameter corresponding to the turning point of the change of the target permeability parameter is used as the specified critical permeability coefficient of the specified bearing pressure.

6. A concrete quality detection device for water conservancy construction as claimed in claim 1, characterized in that: The method for obtaining the specified maximum bearing pressure is: For any specified water pressure, the water pressure in the sealed container is always maintained at the specified water pressure, the applied pressure applied to the concrete block by the first pressure-applying device is increased according to a first preset step length, and an ultrasonic image of the concrete block is obtained after each change in the applied pressure as a target ultrasonic image corresponding to the applied pressure; until the applied pressure meets a preset first applied pressure threshold, the applied pressure is stopped from being increased; respectively acquiring a differential image between each pressure-applied target ultrasonic image and the initial ultrasonic image as each pressure-applied target differential image; For any target differential image under applied pressure, the pixel points whose grayscale values ​​in the target differential image are greater than a preset grayscale threshold are taken as target pixel points, and the target deformation degree of the concrete block under the applied pressure is obtained according to the grayscale value and local reachable density of each target pixel point; According to the change of the target deformation degree as the applied pressure changes from small to large, the turning point of the target deformation degree is obtained by the elbow method; The bearing pressure corresponding to the applied pressure corresponding to the turning point of the change of the target deformation degree is used as the specified maximum bearing pressure of the specified water pressure.

7. A concrete quality detection device for water conservancy construction as claimed in claim 1, characterized in that: The method for testing the quality of the concrete block according to the specified critical permeability coefficient and the specified maximum bearing pressure is: Obtain the mean value of the specified critical permeability coefficient as the reference critical permeability coefficient; Get the average value of the specified maximum bearing pressure as the reference maximum bearing pressure; When the reference critical permeability coefficient is less than the standard critical permeability coefficient and the reference maximum bearing pressure is greater than the standard maximum bearing pressure, the quality of the concrete block is qualified; When the reference critical permeability coefficient is greater than or equal to the standard critical permeability coefficient, or the reference maximum bearing pressure is less than or equal to the standard maximum bearing pressure, the quality of the concrete block is unqualified.

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